A timer circuit design which could be used for turning the position of the eggs in an incubator between predetermined intervals of time was requested to me by one of the keen readers of this blog, Mr. Eugene.
The requested circuit has been exclusively designed by me and published here,
Circuit Specifications
Let's hear the whole episode:
I'm raising chickens for derby and I have hen that is laying eggs. For the hen to continue laying eggs, I need to incubate the eggs. I have researched incubator designs and parts and I have already assembled a simple one. I have a digital 220V ac thermostat and in order to protect it, it will only have to drive a 220V relay. This one already worked well.
Now I have an additional info that the eggs have to be rotated or moved upside down 3 times a day in order for the eggs to hatch well. I am planning to make a rows of eggs holder chained or built together driven by a motor such as electric fan swing motor. Its strong and moves very slowly and I think its quite enough. This 220v ac motor will be driven by a 6v dc relay. Now I need a relay driver circuit and a timer circuit that wil trigger the relay driver more or less every 8 hours for approximately 3 seconds only.
I may not have enough words to reach 300 but I think my intention is clear enough. But if the blog requires 300 words, I will try to extend my explanation.
Thank yo very much and I hope you can help me.
Eugene"
Designing an Incubator Egg Timer Circuit
The circuit of the proposed incubator egg timer and optimizer is given below:P1 should be adjusted for the long 8 hour duration and P2 for the short 3 seconds duration.
Circuit simulation:
Looking at the circuit diagram we can see that it consists of two identical IC 4060 stages which are coupled across each other for implementing the proposed actions.
The upper timer stage is intended for producing long time intervals and therefore its output is taken from pin #3, while the lower IC generates smaller time intervals and so its pin #15 is chosen as the output.
When power is switched ON the following things happen with the circuit:
The 0.1uF capacitor resets the upper IC so that it can start counting, during this period its pin #3 is at logic low which keeps the relay driver stage switched OFF, also the lower BC547 is kept disabled, which keeps pin #12 of the lower IC at high logic which in turn renders the lower IC inactive.
After the predetermined period is lapsed, pin #3 of the upper IC goes high, this switches ON the relay driver stage and also the lower IC pin #12 gets reset, this toggles the lower IC into counting mode.
After the predetermined period, pin #15 of the lower IC becomes high, which sends a logic high to the reset pin #12 of the upper IC, resetting it back to its original position......the cycle repeats, and goes on repeating as long as power is available.
The lower section can be upgraded for generating higher time intervals at par with the upper section by replacing pin15 with pin3 as already done in the diagram below.
The relay contacts are wired up to the motor for shuffling the egg orientation.
Using Rotary Switch for Adjusting the Time intervals
If you find adjusting the pot difficult and time consuming, you could easily replace them (P1, P2) with rotary switches as shown below. The involved could be also easily calculated with some quick and experimentation:
With over 50,000 comments answered so far, this is the only electronics website dedicated to solving all your circuit-related problems. If you’re stuck on a circuit, please leave your question in the comment box, and I will try to solve it ASAP!
Hello Sir;
In line with hatched chicks, I would like to build make circular brooder house with an automatic temperature controller. Not using a microprocessor chip is it possible to design a temperature controller which will switch off when the temperature reaches a set high point and turn ON heaters when the temperature is below the set lower values?
Thanks in advance.
Hello Joseph,
You can try the second last circuit from the following article, which uses the IC LM35:
https://www.homemade-circuits.com/how-to-build-simple-electronic/
Hello Mr swag,
This is a good design , but my question is how can I interface a digital display to the circuit to read the predetermined time directly?
Thanks Yabagi, you can use the following circuit, and configure with the relay output of the timer
https://www.homemade-circuits.com/5-digit-frequency-counter-circuit/
the frequency input can be from a 1 second oscillator using IC 555….precision may not be critical
hi sir If possible I’ll try the circuits you shared.. Thanks
Thanks Rudrud, please do it and if possible provide a small video clips to my email.
Sir what caps i will ceramic or mylar caps?,.help me sir thanks
you can use any type of capacitor as long as it is non-polar.
Sir all value of capacitor is 1uf/25v?
Ken, it can be 1uF or you can change them as per your own choice, higher values will give higher time delays proportionately….
Sir the capacitor in ic 2 connecting the no.16 pins to the ground,.what is the value sir?,.its 1uf or 0.1uf?,…thanks sir
you can use 1uF there for better resetting action during power switch ON….you can use polarized capacitor, positive lead will connect with pin#16 line
Sir what is the value of the capacitor in IC 2 between pin16 and 1M,..is it 1uf or 0.1uf…because in the 1st diagram it is 0.1uf and the other diagram is 1uf,…..and i can use 3v dc motor as trial motor?thanks sir
Ken, I have already answered to your question, use 1uF it will give a better resetting action. for a 3V motor you will need a 3V supply across the relay contact wiring.
for the circuit make sure it is above 4.5V
Sir i have ac 220v motor it indicates CCW/CW what its mean sir?..it can turn clockwise and counter clockwise?help sir,.thanks
Hi Ken, there’s a lot of information available online, if you search “CCW/CW motor” you will be able to find the answers quickly….
Sir can i use 12.6v as a supply voltage,.?,…and if i put the supply the red LED starts to light right?,..my circuit is not working pls help,thanks
Ken, yes the red will light up on switch ON, please refer to the articles for all the details:
https://www.homemade-circuits.com/how-to-make-simple-programmable-timer/
you can connect a LED/1K across pin#14 and ground to check the timer response, this LED will start blinking while the specific IC is counting
Sir if i remove the resistor P1 and P2 what should be the initial time interval and time limit of the rotation motor sir?,.thanks
Sir if i remove the resistor P1 and P2,..what should b the initial time interval and the limit rotation of the motor?thanks sir ,..the circuit is working sir,.i just want to know the intial time so i can make a switch interval sir,.thanks sir swag
Please see the video in the following article, it will allow you to judge the approximate delay at pin#3. In the video I used 10K at pin#10 and 0.1uF at pin#9
https://www.homemade-circuits.com/how-to-make-simple-programmable-timer/
Sir i made the circuit and its working,.thanks for the design and the assistance sir,….
I am glad about it Ken, keep up the good work!
Sir when i connect led in pin#14 the blink is to slow sir,.what should i do sir to make the blink fast,..and does the capacitor in pin#9 affects the time interval,..how to compute ur desired time sir,.thanks
Try pin#7. Yes capacitor at pin#9 and resistor at pin#10 together are responsible for time delays or the frequency:
https://www.homemade-circuits.com/how-to-understand-ic-4060-pin-outs/
Sir the push button is for reseting purpose?,..because some time when i turn off the circuit and turn on again,the lower ic continues to count,..the upper ic not reseting properly,..
Ken, which push button are you referring to?
Thank you sir for your wonderful work. Can I get PCB layout of it ?? Sir please both side or back side only ,
Only you can sir because you are the best I am waiting please sir
Glad you liked my work Anjali, you can find the PCB design in the following post:
https://www.homemade-circuits.com/how-to-make-simple-programmable-timer/
Sir which type of rotary switch I use pls rply
You can use single pole multiple contact rotary switch, the number of contacts will depend on the maximum number of time intervals you may prefer to use
Yes, thank you sir 🙂
One more questions sorry 🙂
I think it is good to use p1 rotary because it need time interval and p2 need duration of time so p2 should be a 1pot ?
Sir I just think but you are the inventor and you are the master! What is your idea ??
You are welcome Fuzail, rotary switch can be used for both the timers, because the selected resistors will allow you to get the precise time intervals as required by you. First try a randomly selected resistor and check the ON + OF time interval at pin#3, then you can add more selectable resistors calculated proportionately for getting other time delay options
Hii sir,
My name is Fuzail Kareem first txn for your good and helpful work I really like you website and your work
Sir my question is how can I change both on and off time as according to my need sir it why because egg need to turn daily (circut on time ) 3-5-7 time and also It must be necessary to every egg it turn whole I mean front to back and it take time more than 3 second and depend quantity of egg
Pls reply sir
Hi Fuzail, you can replace P1 and P2 with rotary switches and set the timing as per your preferences, please check out the last updated diagram
Txn for your valuable response
Hello i buld the circuit but i have a problem my led is flashing . please help me. Thanks
Sir Swag , P1 and P2 (100k resistor) is a variable resistor?pls help,.thanks
yes those can be 1M pots or presets
Hi! Sir what Load and Supply voltage i wll use in the circuit?,itry to make the circuit and i dont know what to use,pls help me sir,im newbie,thanks
Hi Ken, load will be your motor for shuffling the eggs, and the supply input will be the voltage as per the motor specs.
Thanks si swag,…sir what direction of the rotation of the motor?is it clockwise or counter clockwise?,..or both clockwise and counter clockwise?,…
Sir swag,.how can i make the 1st turn of motor is clockwise and the 2nd turn is counterclockwise,…alternate sir,..pls help,thanks
Ken,
You can try the following concept for getting a bidirectional motor operation
https://www.homemade-circuits.com/programmable-bidirectional-motor-timer/
Ken, you can try the following concept
https://www.homemade-circuits.com/programmable-bidirectional-motor-timer/
Sir,whats the value of the relay?thanks
relay can be any standard 12V relay
Can you pls make a egg turner and also DC mother speed control with desirable direction and with two direcation
If possible i will try to update the article with these info soon
Can i use 220V AC supply as Supply voltage?,..pls help,.thanks
yes you can if the load is also rated to work with 220V
Hi.
Anybody can supply me this timer. O anybody compleeted this timer. Call me on 84949 15158
Thanx.
I have built this timer many times with 100% success. It is one of my best designs.
Can i have ur cell number. I need 6 sets or atleast 1 for my hatcher.
Sir I need help on how to make Display on this circuit for temperature with LCD display , is it possible with this circuit? Any link or help will be highly appreciated …
Imran, you can use an LM3915 IC for making a bar graph type temperature indicator circuit, but it will need to incorrectly integrated with the tempwerature sensor.
bro you told to me permanent magnet brushed type to this circuit is that motor dc or ac motor and which motor works with this circuit dc motor or ac motor
it's a DC motor,
the above circuit uses a relay, which means you can use any motor, does not matter whether it is a DC or AC, you just need to connect the relay contacts accordingly with the relevant supply input and the motor
DEAR SIR, Can u please adjust the circuit for every 2 hours interval switch on 3 seconds only for my homemade egg turner. I am new here. Please let me know the resisters for UPPER IC (2 hrs interval) also capacity of potential meter to be used. Also let me know which resisters can be used for LOWER IC (3 seconds) and also explain about the capacity of relay. I am going to use 12v 3.7 RPM motor
Dear Michael, It won't be possible for me, because it will need to be done with practical experimentation.
you can do it in the following manner:
in the above given set up you can keep the P1 short circuit so that only R2 becomes the timing component.
Switch ON power and using a stop watch check after how many seconds the green LED lights. Note this down and from this data you can find out the other required timing cycles using the following simple cross multiplication;
P1+R2/R2 = x/Recorded Time, where x is the desired time interval.
for example if you got 10 seconds from the above experiment and the desired interval is 2 hours (720 seconds), then the formula could be solved as:
(P1 + 100)/100 = 720/10
P1 + 100 = 7200
P1 = 7200 – 100 = 6200K
Remember the above calculation is just an example, and the figures are arbitrarily selected.
Why P1= 7200-100=6200k
how it happen sir,..thanks
Thank you very much sir. If any of friends have already built diagram like 2 hrs off and 15 seconds on, please send to my email id [email protected]. Thank u very much
bro can you please send the list of all components for this circuit i mean how many resisters and how many capasiter ect please bro
bro small dout ani limit switches in this circuit sorry for asking ian completely accounts student thats why i am asking doutes thanks in advance
Balu, this is a timer circuit, no limits are included here, you may have to adjust the speed of the motor to match with the selected timing interval of the circuit
ok which motor is best for this circuit bro
it will depend on the load, that is the number of eggs that may be required to be moved by the motor.
a permanent magnet brushed type will do…
hai bro, can u send the pic circuit board i cant understand your picture so please send some pics of buided circuit board and limit switch s pics please thanks in advance
please click on the diagram to enlarge it, you will be able to see all the components and their numbers clearly.
Bro, can I use 1uf/400v polyester type capacitor
yes you can use it
Hello Sir 1uf/63 capacitor is not available in my location.
What to do?
Dinesh, you can use many 0.47uF/50V capacitors in parallel….
sir i am again
cant get 1uf non polar
i just got 474j 450 volt
is it work?? am i use 2 in parallel
Hi Fuzail, yes definitely you can use two of them in parallel, it will work
Hello Sir can I use bc548 and replace c1 47uf/63v ,p1 220 kilo ohm ,R2 470 kilo ohm.please reply me
hello Dinesh,
will do, however P1 and the 1uF parts decide the time length…220K , and 470K are fine, but try using more numbers of 1uF/63 in parallel to get higher delay ranges. it must be non-polar
hello am new in electronics .can someone please provide me with a pcb for this timer
Hello my brother I buy a relay timer FRM01 12v I not how conect my 220volt 4watts engine can show my a diagram Please, I need to turn the egg
with a multimeter in the diode range check which outputs of the relay close or open while the timer is counting or finished counting….with this info you can connect the motor with these contacts accordingly
I have a +5V output in my incubator, the timer circuit should work OK with that, right?
Of course, I need a relay with a 5V coil instead but other than that I don't see any problems.
yes that's correct, either you can use a 5V relay or you can opt for a triac control for the load
I have built it again, i think the upper ic work well, i check with led pin 15 and it blink and i have changed pot with 500k and it work good. But the lower ic become touch sensor. When i touch the output ( NC/NO) relays wired, the led lower ic blinks but when i do not touch it, blinks stop and next on like that, what happen on my circuit, please help sir, i am new on elektronics
the lower IC will not function until the upper IC has finished counting, …..in other words when the lower BC547 is triggered only then the lower IC will start functioning……in other words when pin12 of the IC is held at the ground potential only then it will start counting and functioning.
this is the image sir, please check, maybe something I missed
https://drive.google.com/file/d/0BwFU-bL_-g3deDRxU1QtVGdTYzdvMU1xWEtaZ1VCcVplOGpr/view?usp=sharing
OK, I can see it now, but to trace it correctly from my side would be quite time consuming…so you might have to confirm it yourself with the given diagram…the diagram is cent percent correct.
DEAR SIR, PLEASE SEND SIMPLE DIAGRAM FOR EGG TURNER TIMER CIRCUIT AND THERMOSTAT CIRCUIT FOR CHICK INCUBATOR. I HOPE U WILL DO THE BEST. PLEASE SEND TO ME EMAIL [email protected]
thanks sir, I almost success to built it, when I connected led across pin 7 via 1 k resistor the led blink fast, and also pin 15 also blink and slowly but the P1 cannot change blink speed, the other hand, the lower IC do not blink. whats going on, I have drown pcb lay out. please check sir, maybe something wrong on the connection that I dont know.
https://drive.google.com/open?id=0BwFU-bL_-g3deDRxU1QtVGdTYzdvMU1xWEtaZ1VCcVplOGpr
Harvest,
the lower IC will function only when the upper IC time period has elapsed and the lower IC is triggered.
your pot may be faulty or not properly selected make sure its value is 1M and its pins are correctly connected
your image is not opening because it's not "shared"
hi sir i use adaptor 12 v 1 a. Nothing diffrence with the firs time, led on and dreary, when i connected led across pin 16 and ground via 1 k resistor, this led on and brightly. When i connected led across pin 15 and ground via 1k resistor nothing happened led still off, would you like to help me this issue,,
Harvest, initially the red LED should be ON brightly, and when the time elapses for the upper IC, red LED should shut off and green LED should illuminate….if connected at pin16 or pin 15 the LED should flash
I think something's not right with your connections or the circuit.
I use 12 volt dc transformerless power supply, when I first operated it, the red led is on but its dreary i think because its current input low, after that i have been waiting long and nothing happened, the red led still on. Whats going on sir? I use 2M for R1
check with a 12V AC/DC adapter for confirming the circuit operations, and anyway a transformeless power supply might not work, it could produce wrong results and might not be capable of the driving the relay….
2M is fine for R1
C1 must be non-polar
Hi sir can i use 12 V transformerless adaptor to be the power supply to this circuit? I have made the adaptor, but im not sure about amp issue, please help,,
Regards
Hi Harvest, the current is not important, but make sure the voltage is strictly within 15V, then it can be safe to use.
Hallo sir,
Im having a prob, at first i made the circuit without led and keep it for aomedays and it was working very good, after somedays i try to add the led but when i power it on relay activates with red led, but when i disconnect the red led the device works good again, what could be tje problem sir? Thanka
hello riya,
try a higher value series resistor with the red LED, use a 10K or 15K resistor and check the response.
Dear sir
Here how i built ur circuit, at first i built the upper ic option and when i power on it was working 100 percent ok, after that i attach the liwer ic option nut after that i connect a led across negative and upper ic pin 7, the led blinks as well but nothing happen with relay or liwer ic ,i added abrand new ic for lower portion, but still works nothing, i waited for long long time but result is same,, is the problem with 4148 diod? Or how can i solve it ? My lower ic ppt is 10k and r2 is 10k where upper on is 100ksl s, thanks.
Dear Riya, you must do exactly as given in the diagram…the resistors should be 100k for the pot and 2M2 for R1….the diodes are OK and must be included…connect LEDs in series with the transistor bases, that is in between base and the 10K resistor of both BC547s….the LED will indicate when and how the transistors are conducting in sequence or if there is any mistake in the IC function..
Hi sir,
Im a new hobbiest, i was looking for a timer for long and i found it in ur blog, but after i made it im having some common probs, that is when i power it up relay activates and red led on, after some time grenn led turns on but red does not fully off ,it deems but keeps on and no change to relay, im using 10k for R2 and 10 k pot for p1 for both ic, my ics ar new and good quality, i made it several time bt problem is always same, and there is no probs wit any resistor,, sir pleaae tell me what can i do?
Hi Riya,
Your circuit may not be correctly assembled, because on power switch ON the relay should not activate. The relay will activate only after the upper IC time has elapsed, and deactivate when the lower IC time has elapsed.
something is wrong in your circuit, may be the transistors are not connected correctly.
On powering the REd LED will be ON, never both.
Hi bro,
its tanvir again, ur great device i made last time was working so good for long but suddenly i see its wrkin wrng, whn i power it up relay activates, and relay transistor bc547 gets extreemly heated. I changed the trans i changed the 10k resis, even changed the 4060 upper ic, but it still hving the same problem, i tried a lot to solve the probs bt couldnt do anything, so can u please help me to solve it? Thanks
Hi Bro,unless the input voltage is increased above 18V or there's some short circuit in the circuit, it's unlikely to become hot or malfunction, or may be the ICs you have used are not of good quality.
Try Using a 12V AC/DC SMPS adapter instead of transformer.
Dear bro,
I made the display driver its working great,, and I'm so happy for it, but bro is it possible at a display witch will show the set time when I'll turn the pots? Thanks
Dear bro, which circuit are you referring to? i can't remember, please comment under the same article..
The circuit was http://www.next.gr/uploads/14/dig_poc.gif but my requirement was like when I'll turn the pots, led display will show the times like if set the timer for 4hours and relay for 5 mints these times will appear on the led display… is it possible my brother??
It looks difficult with discrete components, sorry bro not possible because display circuits are not easy to design using ordinary components.
ic, its for back EMFs, thank you very swagatam!
Thank you very much Swagatam! IT WORKS! can I remove P1 and replace R2 with my desired resistor value to get my desired timing? Im a programmer swagatam and no background in electonics, thank you very much for guiding me,.. 🙂 what is the use of 1N4007 diode in relay? if i have multiple relay do i need to put diode? can i add fuse or any safety features?
my next project is your Solar Battery Charger, moving to the next level hahaha,..
You are welcome Unknown! yes P1 may be replaced with a suitable resistor for enabling the intended fixed oscillation periods
The 1N4007 will protect the driver transistor from relay coil back EMFs, for multiple relays in parallel a single 1N4007 would be sufficient, individual diodes may not be required. However the transistor may need an upgrade if the relay count is over 2. You can try a 2N2222 or a 8050 in place of the shown BC547.
A fuse is not crucial and may not be required for such low voltage DC operations…
wish you all the best for your next project…keep it up:)
i buy new of components 🙂
what if i only want 2 hour On and 2 hours Off? i will remove the Pin #3 and 1N4148, Pin #8, Pin #12, 1M, Pin #16, and BC547 and it base resistor?
for equal time durations, you can completely eliminate the lower IC stage along with the lower BC547…not the upper BC547 stage…
The 1N4148 will also need to be removed for obtaining a sustained ON/OFF response from the IC.
hi swagatam, i tried to build the circuit, when the power applied the relay activate, the red LED illuminate, the green LED off, On pin #7 I connected 1k resistor and LED to the ground on both IC`s, they are both blinking, after 30 mins the red LED Off and the green LED On 30 seconds, but noting's happen on my Relay, after 30 seconds, the green LED Off the red LED On, but the LED on upper IC pin #7 is not blinking, the lower IC still blinking.
I used 104 cap ceramic type and 1uf/50v cap non polar similar to this -> us.100y.com.tw/product_jpg_original/A011025.jpg, is their something's wrong with my circuit?
Hi unknown, when power is applied the relay should NOT activate….may be the circuit is getting latched at the onset itself….try increasing the 0.1uF at pin12 of the upper IC to 0.22uF or higher and check the response.
I rebuild the circuit, when power is applied, RED On, Green Off, pin #7 Blinking, Relay was not activated, after 30 mins RED Off, Green On, pin #7 stop blinking, but still the Relay was not activated,. i replace all my caps 104, 105 to Mylar type capacitor
It indicates that the relay transistor may be faulty or not connected correctly or may be the base 10K ersistor is faulty.
Hi i made this circuit but i used 1uf electrolite caopacitor but it not works? because it should be NP? when i apply power relay activate? is it activate or not?
Hi, even with a electrolytic capacitor the relay should NOT activate on power switch ON, there could be some other fault in your circuit.
Dear sir, I made the circuit and I'm so happy that my circuit work fine more than I expected…I replaced the pots with 1megs and in order to check the blink rates of both the ics I used two leds on both 7 pins of the ics with 1k resister,
And to my dear friend who has commented on this circuit. Plzz take a bit of time to carefully study the diagram and make it… if you do exactly do as said believe me it works 100%
And once again thank you so much sir 😀
That's great Srishan, congrats to you, I appreciate your hard work, and dedication.
Thank you sir…. 😀
Sir I did the circuit but I only need 20 mins on the upper ic… hw can I get it done? And I couldn't find 1uf/25v caps bt I only got 1uf/1000v non polor. Will this make a problem? And does the 0.1uf cap has a voltage rating?
Srishan,
1uF/1000v will also work, use a 1M pot for the upper P1 and set it to get the required timing by some trial and error.
0.1uF can be a 50V disc capacitor.
you right sir i just made an error in wiring the components. i now have to tell you that the circuit is working properly now it's great. i followed your instruction and replaced the upper pots with 1m pots and connected the lower 1N4148 diode to pin 6. now i have 1 hour off and 15 seconds on. now i'd like to increase the upper timer to be 3 hours. i like your circuit thank you very much sir.
that's great Rood, you can increase the upper IC timing by connecting more number of capacitors in parallel with C1, all should be strictly non-polar type.
hi sir could you please guide me to solve my little problem? i have tested the circuit on project board and it worked but i couldn't set the time interval to be different, i upgraded the lower caps and resistor to be higher but it wasn't changing the time interval. the relay was only on about 3 minutes and then of about 3 minutes again. i need 20 seconds on and 2-3 hours off. thanks in advance
Hi rood, something's not right in your circuit for sure.
connect an LED with a series 1k resistor across pin7 and ground of the lower 4060 IC. (cathode to ground)
As soon as the red led shuts off this LED should start flashing indicating that the lower stage has been activated.
If you don't see this response could mean an incorrect wiring or faulty components.
dear sir, led blink or not if the circuit in operation
no blink, only light
dear sir mean led willl light on when 12v switch on and green led will on when motor turn on,rite?
yes that's right.
Hi sir..can I use this.circuit for a hydroponic irrigation system? All I want to do is to run a mini water pump of 12v every 3 hours for 20 mins….. will this circuit do the needful???
Thank you
Hi Srishan,
yes it can be used and will work perfectly, just make sure the relay contacts are rated according to the load amps.
Thank you so much sir…..:D
dear sir what function.of led in circuit. i made this circuit unfortunely the led not lighting when i turn on the power. can u explain. thanks
dear Rizsha,
red indicates upper timer is counting, green indicates the lower is counting.
if none of them are lighting means something's wrong with your circuit.
thanks bro, it happened as i told u before, that i am totally new in this site,,, and i appreciate ur comments ,, as because u are now my honorable teacher.. Thanks
you are welcome bro, I'll try my best to help you out in the field.
and i want to make it digital,, so can u pls help me out ? can u pls draw this device's diagram with a seven segment led or lcd display?
presently don't think about it bro:) when you are not able to make such a simple circuit which is shown above, how would you be able to make a complex digital circuit integration with the above.